Polygons - Interior and Exterior Angles

Calculating angles in a regular polygon.

How to calculate an angle in a regular polygon is quite simple. Take a look at the graphic below to see how it's done:
n = number of sides in a regular polygon. (A is the sum of all the interior angles inside a regular polygon.)

The sum of exterior angles.

A simple rule: The sum of all exterior angles on a regular polygon is equal to 360 Another simple rule: the measure of 1 exterior angle (where n = the number of sides in a regular polygon. or n (where n = the number of sides in a regular polygon.